Improvement in burglar-alarms



No.17L754.

F. H. ALLEN & :r. LATHROP.

BURGLAR ALARMs.

Patented March 14, 1876.

NPETERS. PHOTO-UTHOGRAPHER, WASHINGTON D C.

ried in a valise or pocket.

UNITED STATES FRANK H. ALLEN AND JAMES LATHROP, OF NOR PATENT DFFIOE.

OF ONE-THIRD THEIR RIGHT TO JOHN E. WARNER, OF SAME PLACE.

IMPROVEMENT IN BURGLAR -ALARMS.

Specification forming part of Letters Patent No. 174,754, dated March14, 1876; application filed Q February 18, 1876.

To atl whom it may concern:

Be it known that we, FRANK H. ALLEN and JAMES LATHROP, both of Norwich,county of New London and State of Connecticut, have invented certainImprovements in Burglaropened by any one effecting an entrance.

Our especial object is to render a lodgingroom perfectly secure fromburglars visits, or, it such visits occur, to awaken the sleeper, sothat he may be enabled to meet the intruder and protect his property andlife.

In the accompanying drawing, A and B are bells of con 'enient size andshape to be car- On A is a projection or stud, G, which is threaded andtapped into the bell B at f. g is a string or elastic cord, on one endof which is a screw-eye, h, the other end being made fast to the stud 0.Through the stud O is a hole, 6, of sufficicnt size to receive a pin orneedle. a, a a a are projections on the bells AB, pointing toward thecentral shaft or stud G. d is a weight or hammer, hangingon the wire b,which, in turn, is fastened lightly to the stud 0 by loops or rings ateither end, i i.

To operate this device on a door, wind the cord g around the stud 0.Screw the screweye it into the door or door-frame deep enough to sustainthe weight of the bells. .Then, with When the door is opened by any onefrom the outside, the alarm. is pushed off the pin, and the weight ofthe bells causes the cord to he unwound, giving a rotarymotion to thebells, the weight or hammer d at the same time striking the projectionsa a a a alternately, making a noise loud enough to awaken the soundestsleeper.

Should an elastic cord be used, the impetus gained by the revolvingbells in descending will cause the cord to unwind and rewind itselfseveral times before it becomes motionless. 7

We claim.

In combination with the bells A B, the pendent wire I), with themetallic hammer d,

the cord g, and screw-eye h, all arranged and operated as and for thepurpose specified.

In witness whereof we have hereunto set our' hands and seals this 16thday of February, A.'D. 1876.

FRANK H. ALLEN. [L. s.]

JAMES LATHROP. [L. s] In presence of- JOHN DURHAM, J r.,' LESLIE W.BEACH.

WIGH, ooNN, ASSIGNORS

